This sink tapers from top to bottom by 1/4"3 1/2" Center drain.Wall Thickness : 3/4"Non ReversibleBottom Width:25 3/4" Top Width 26" .Inner Dimensions 24 1/4" x 17 1/4" x 9 1/4"Due to the organic nature of the fireclay, material dimensions may vary by 1/8" of an inch. We recommend having the sink on location to trace and measure for countertop and cabinet cut outs. Furthermore , minor imperfections may appear. These are not defects; this is what makes each sink uniquely its own. Defective sinks will not pass our quality control inspection and would be recycled into a new sink at the factory.Capable of being installed via Under-Mount (countertop Over edge of sink), Top-Mount (countertop Under edge of sink), or Flush-Mount (countertop Even with sink)This sink is constructed of solid high-grade fireclay material using high pressure casting, ensuring durability, longevity, and resilience to acids, alkali's, scratches, and chipping.Heat resistant up to 350' F. This sink has been tested and will not crack due to heat exposure from a pot / pan up to 350' F hot.